Remote Loopback Bench Test - TC Communications TC1540 User Manual

Remote Loopback Bench Test

Purpose: This test loops the composite optical & electrical signal at the remote unit back to the local
unit (via fiber) in order to test each unit's optic functions and LED indicators and to verify
the integrity of the fiber optic link.
Equipment
Requirements: One (1) Bit Error Rate Test (BERT) Set with appropriate interface module.
At least two (2) optical jumper cables (patch cords) with appropriate connectors.
Procedure: Set up the bench test as shown in Figure 16. On the remote unit, set SW2 (RMTLB)
to the Right position and connect a BERT tester to the local unit. Set the tester up as
a DTE device (refer Fig. 15 for DTE device connection). The "TD" and "xD" LEDs (on
both TC1540 units) should light, indicating the status of the looped signal. The BERT
tester should indicate a "SYNC" signal. This test can be performed from either (or both)
direction(s).
BERT
or
ASCII Terminal
Figure 18.
TC1540
TxD
RxD
RS-232
Set SW3 to left
Remote Loopback Bench Test Connection Diagram
Optic Cable
- 19 -
TC1540D User's Manual
Rev. 1.2
TC1540
RxD
TxD
Set Sw5 to right
(Remote loopback)